10-08-2013
You cannot redirect a process after you start it. If you want dd's stderr to write into a file, you have to redirect it there in the first place.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hiya,
Recently I've run a few scripts in the foreground, but have realised later they should of been better nohup'd and placed in the background. I understand how to change a foreground job into a background one, but how would put the job into the nohup state?
Thanks (1 Reply)
Discussion started by: rdbooth
1 Replies
2. Shell Programming and Scripting
Hi all,
I am running a job .. and i want to know the status tht it is runnig or not ..
and how can i find the jobId of my job ..
I have to get it to kill my running job
Pls let me know da Unix commands to do it ..
i m wrking on Hp UNIX (1 Reply)
Discussion started by: ravi.sadani19
1 Replies
3. Shell Programming and Scripting
I have run one shell script in background that contains a endless while loop.
I am not able to know the status of that job .
Please provide any command to know this. I have already used "ps -aef" , "jobs" to know it , but it didn't work. I am sure the process is running as it is generating a file... (8 Replies)
Discussion started by: sumanta
8 Replies
4. AIX
Guys,
We use AIX 5.3 at our work place. I only in my team have a strange problem of not able run jobs background. Other colleagues are able to run without any problem.
Once I kick off background job using nohup and & command, It immediately stops. The following error I get when I run.
... (2 Replies)
Discussion started by: anandsbr
2 Replies
5. UNIX for Dummies Questions & Answers
Hello,
I am running a shell script whose execution often takes several hours to complete. Is there way I can get some kind of status update as the job is running? Something as simple as the start and the current time stamp.
Thanks,
Gussi (2 Replies)
Discussion started by: Gussifinknottle
2 Replies
6. Shell Programming and Scripting
Hi All,
I have a scenario where I am executing some child shell scripts in background (using &)through a master parent script.
Is there a way I can capture the exit status of each individual child script after the execution is completed. (2 Replies)
Discussion started by: paragkalra
2 Replies
7. UNIX for Dummies Questions & Answers
Is there a way to suspend (TSTP?) a job that is running in the background, _without_ first bringing it to the foreground and inputting Ctrl-Z from the keyboard?
IOW, something similar to issuing the shell's bg builtin command on a job ID to resume a job that is suspended in the background,... (2 Replies)
Discussion started by: uiop44
2 Replies
8. Shell Programming and Scripting
Hello Everyody,
Having a doubt.
sort file1 &
when we sent a job to the background it returns
Job Number
PID
again if we want to ... (1 Reply)
Discussion started by: knroy10
1 Replies
9. Solaris
Hi,
Should the user jobs specified in crontab be running in background?
Cron daemon is already running in background. So I am not sure
whether should the jobs (output and error messages are redirected to file)
ran by it be explicitly stated to be run in background (& at end of command)
if one... (1 Reply)
Discussion started by: joe_x
1 Replies
10. Shell Programming and Scripting
Hi,
I want to write a script which continuously checking status of a script running in background by nohup command. And if same script is not running then immediately start the script...please help..
i am using below command to run script
nohup system_traps.sh &
but in some... (9 Replies)
Discussion started by: ketanraut
9 Replies
LEARN ABOUT OSX
tc-mirred
Mirror/redirect action in tc(8) Linux Mirror/redirect action in tc(8)
NAME
mirred - mirror/redirect action
SYNOPSIS
tc ... action mirred DIRECTION ACTION [ index INDEX ] dev DEVICENAME
DIRECTION := { ingress | egress }
ACTION := { mirror | redirect }
DESCRIPTION
The mirred action allows packet mirroring (copying) or redirecting (stealing) the packet it receives. Mirroring is what is sometimes
referred to as Switch Port Analyzer (SPAN) and is commonly used to analyze and/or debug flows.
OPTIONS
ingress
egress Specify the direction in which the packet shall appear on the destination interface.
mirror
redirect
Define whether the packet should be copied (mirror) or moved (redirect) to the destination interface.
index INDEX
Assign a unique ID to this action instead of letting the kernel choose one automatically. INDEX is a 32bit unsigned integer greater
than zero.
dev DEVICENAME
Specify the network interface to redirect or mirror to.
EXAMPLES
Limit ingress bandwidth on eth0 to 1mbit/s, redirect exceeding traffic to lo for debugging purposes:
# tc qdisc add dev eth0 handle ffff: ingress
# tc filter add dev eth0 parent ffff: u32
match u32 0 0
action police rate 1mbit burst 100k conform-exceed pipe
action mirred egress redirect dev lo
Mirror all incoming ICMP packets on eth0 to a dummy interface for examination with e.g. tcpdump:
# ip link add dummy0 type dummy
# ip link set dummy0 up
# tc qdisc add dev eth0 handle ffff: ingress
# tc filter add dev eth0 parent ffff: protocol ip
u32 match ip protocol 1 0xff
action mirred egress mirror dev dummy0
Using an ifb interface, it is possible to send ingress traffic through an instance of sfq:
# modprobe ifb
# ip link set ifb0 up
# tc qdisc add dev ifb0 root sfq
# tc qdisc add dev eth0 handle ffff: ingress
# tc filter add dev eth0 parent ffff: u32
match u32 0 0
action mirred egress redirect dev ifb0
SEE ALSO
tc(8), tc-u32(8)
iproute2 11 Jan 2015 Mirror/redirect action in tc(8)